Sand-blast machine



April 23, 1929- G. c. FATscHER ET AL 1,710,612

SAND BLAST MACHINE Filed Mannie, 1925 4 Sheets-Sheet 1 peooo O O O 0 O o o a o o o H] e 20 e o o o o o o o o o o o o 2 INVENTORS 6 504-65 C, FQTJCHEA CLHIFENCE E. Bu. 1. 1 /55 A TTORNE Y April 23, 1929- e. c. FATSCHER El AL 1,710,612

SAND BLAST MACHINE Filed March 26, 1925 4 Sheets-Sheet 2 -'CLHRENC 8 BILL/Ives :A'Prfl 1929- G.- c, FATSCHER ET AL 1,710,612

SAND BLAST MACHINE Filed March 26, 1923 4 Sheets-Sheet 3 INVENTOR GEORGE C. 'flfsc HEP CLflwe/vce E-EILLl/v/Gj A TTORNE Yd April 3, 1929. G c. FAfscHER ET'AL 1,710,612

SAND BLAST MACHINE Filed March 26, 1 923 4 Sheets-Sheet V IN VENTOR GEORGE ,C'. Fnrsc HER CLHRENCE E. 5/1. I. INGS A TTORNE Y6 Patented Apr. 23, 1929.

UNITED STATES PATENT OFFICE.

GEORGE C. FATSCHER AND CLARENCE E. BILLINGS, OF NEW HAVEN, CONNECTICUT,

ASSIGNORS TO THE NEW HAVEN SAND-BLAST COMPANY, OF NEW HAVEN, CON- NECTICU'T, A CORPORATION OF CONNECTICUT.

SAND-BLAST MACHINE.

Application filed March 26, 1923. Serial No. 627,680.

Our invention relates to sand blast ma chines, and particularly to apparatus of the rotary drum type.

Among the o )jccts of our invention may be mentioned (1) The automatic recovery of the blast sand for re-use;

(2) The cleansing of the sand by a counter draft to remove dust and like particles therefrom so that the sand is kept in the best condition for its effective operation;

(3) A more eflicient blast mechanism;

(4) A simple and rugged constructirm oi the barrel elements including ready accessibility for repair;

(5) An-improved drive for the barrel;

(6) Various features of detail construction hereinafter pointed out or illustrated in the accompanying drawing in which- Fig. 1 is a broken elevation of the chargingend of an apparatus in which our invention is embodied in oneform;

Fig. 2 is a vertical section on the line 2-2, Fig. 1;

Fig. 3 is a broken elevation of the elevator end of the machine;

Fig. 4 is a broken plan of the elevator drum; and

Fig. 5 is a section on the line 5-5, Fig. 2.

The present apparatus is of the self-contained type and in certain particulars is related to its prototypes in the Dreisbach Patent No. 948,271, February 1, 1910, and the copending application of G. E. Billings Serial No. 627,693, and our copending application Serial No. 627,679, (now Patent No. 1,661,93 both filed herewith.

While the invention is capable of embodiment in various constructions, we have illustrated an apparatus which is simple and efficient. It comprises a rugged sheet metal barrel body 6, perforated at 7 to form a cylindrical screen for the reception of the castings or other articles to be sanded. The screen is clamped between the webs 8 and "9 of the bearing rin s 10 and 11 by means of the tie bolts 12. The draw-up nuts 13 of the latter are exposed at the charging end of the barrel and are thus readily accessible for removal.

At one end the barrel is closed by a head 14 centrally apertured at 15 to admit a blast nozzle 16, and secured to the web 9 of the bearing ring 11 by bolts or rivets 17. At its opposite end'the barrel is closed by a semicircular head 18 to which is hinged at 19 a complementary semi-circular door 20. The head 18 is into ral with an annular flange 21 which is detac iably fastened by cap screws to the web 8 of the bearin ring 10. Latches 23 carried by the door and engaging keepers 24, secured to the web 8 of the bearin ring 1i), hold the door 20 normally closed. The door 20 and head 18, as well as the head 14, are all protected against wear by renewable lining plates 25 s aced from their inner faces by bosses tappe to receive securmg screws 26. In order to thoroughly ventilate the blast chamber, the door 20, head 14, and also the head 18, if desired, are perforated by holes 27, the draft escaping around the margin of the plates 25.

Surrounding the body 6 of the drum, but spaced therefrom, is a lighter sheet metal shell 28 which encloses the tie bolts 12 and forms an annular chamber 29 for the recc tion of the sand which passes through t c perforations of the screen bod 6 after sifting through the charge of castings; Within the annular chamber and secured to the shell 28, is arranged a spiral rib 30 extending from.

end to end of the barrel and serving as means for causing the automatic return of the sand to the elevator end of the barrel.

The web 9 of the bearing ring 11 is apertured at appropriate points 31 to permit the esca e of the sand delivered by the spiral 30 to tie elevator drum 32. The latter is of Within the upper portion of the drum is arranged a chute 138 into which the sand is discharged by thebuckets 36 of the channel 33, which receives the sand directly from the drum through the ports 31. A guard late 39 at the top oi. the chute extends toward and lies adjacent the ring partition 35, to pre vent the escape of thesandinto the channel 34 on its discharge from the buckets 36. At its lower end the chute 38 is oflset and its discharge port 40 is arranged to deliverto imaem the drum may be halted when the door 0 ning is down and the castings be then rake out -or rotation may be continued until the castings work out automatically.

Various modifications in details of construction will readily occur to those dealing with the roblem Without departing from what we c aim as our invention.

We claim- 1. In sand blast apparatus, the combination with an exterior pressure sand blast tank, of a rotary sand blast barrel formed from perforated heavy sheet metal, a surrounding lighter sheet metal shell spaced therefrom, deflecting means arranged in the space bet-ween the barrel and shell for deflecting to one end of thebarrel the sand passing through the perforations of the barrel body, a lifting drum of light sheet metal rotating with the barrel body and adapted to receive and elevate the sand deflected to said end of the body, means for delivering the lifted sand to the exterior sand blast tank, a rotary head at the opposite end of the barrel,

- said head including a charging and dis charging door, together with a nozzle adapted to discharge through said rotary barrel head the sand blast derived from the pressure tank. y

2. In sand blast apparatus, the combination with an exterior pressure sand blast tank, of a rotary sand blast barrel, means for playing sand under pressure from said sand blast tank upon a charge Within the barrel, a rotary lifting drum at one end of the barrel, means for diverting to said drum the sand discharged into the barrel, means for causing a draft to pass through said drum, said drum discharging through said draft the sand received from the barrel to remove entrained dust therefrom and serving to lift the cleaned sand apart from the sand received directly from the barrel. together with means for diverting the lifted and cleaned sand to the pressure tank.

3. In sand blast apparatus, a rotary blast barrel having at one end a centrally apertured rotary end closure movable to permit charging and discharging of the barrel, and means for supporting a nozzle at the aperture, said support being movable to shift said nozzle away from the aperture.

i. In sand blast apparatus, a rotary blast barrel apertured at one end and having a swinging 'doorat said end, means for supporting a nozzle at the aperture, said support be ing movable independently of the door to shift said nozzle out of door-obstructing position.

A rotary sand blast barrel having at one end a hinged closure rotating therewith but affording a charging and discharging opening, said barrel end being centrally apertured to permit the play of a sand blast therethrough on a. charge within the barrel, an independently pivoted hinge rod vertically arranged adjacent said apertured barrel end, a bracket vertically adjustable on said hinge rod, and means associated with the bracket for supporting a blast nozzle at the central aperture in the barrel end. i

6. A sand blast barrel having at one end an elevator drum comprising a plurality of se ries of elevator buckets spaced longitudinally of the drum axis, partitioning which separates each bucket series from the adjacent bucket series, chute means Within the drum for receiving the discharge from one bucket series and delivering it to another bucket series, and a suction wind box opening to the upper portion of the chute for creating a draft theret-hrough counter to the fall of the sand. i

7. A rotary sand blast barrel having at one end a stationary chute for sand delivered thereto from the barrel, a suction wind box opening to the chutefor creatin a draft therethrough, means for elevating blast sand from the barrel and discharging the same through the chute counter to the draft, and means for delivering the sand passing through the chute to an exterior pressure blast device.

8. A rotary sand blast barrel having at one end a stationarychute for sand delivered thereto from the barrel, a suction Wind box opening to the chute for creating a draft therethrough, means for elevating blast sand from the barrel and discharging the same through the chute counter to the draft, and means for delivering the sand passing through the chute to an exterior hopper, together with bafllcs arranged in the chute for dispersing the sand across the draft.

9. A rotary sand blast barrel having at one end a rotary elevator drum; a stationary closure head for one end of the drum an external pressure blast tank having a collecting hopper, a chute passing through said closure head for delivery to the sand-collecting hopper of an external pressure tank, and meanscarried b said drum for lifting and discharging to said hopper spentsand led to said drum from the barrel in combination with blast nozzles adapted to play through the opposite ends of the barrel upon a charge within the latter, and connections from said nozzles to the pressure tank.

10. A rotary sand blast barrel having at one end a rotary elevator drum, a stationary closure head for one end of the drum, a chute passing through said closure head for delivery to an external hopper, and means carried by said drum for liftingand discharging to said hopper spent sand led to said drum from the barrel, together with means within the drum for removing entrained dust fromthe sand in advance of its delivery to the chute.

11. A sand blast apparatus comprising a rotary drum having at one end a charging door opening, together with a door rotating With the barrel and apertured to admit a blast nozzle to play upon a charge Within the barrel. i

12. A sand blast apparatus comprising a rotary drum having at one end a charging door opening, together with a door rotating with the barrel and apertured to admit a blast nozzle to play upon a charge within the barrel, together with means for supporting the nozzle at said blast aperture.

13. A sand blast apparatus con'iprising a rotary drum having at one end a charging door opening, together with a door rotating with the barrel and apertured to admit a blast nozzle to play upon a charge within the barrel, together with means for supporting the nozzle at said blast aperture, and a guard for closing the blast aperture around the nozzle,

14:. A sand blast amiaratus comprising a rotary barrel having at one end a charging and discharging opening, a rotary closure .ior said opening, said closure being apertured, and means for playing the sand blast through the aperture in said rotary end closure upon a charge within the drum.

15. A sand blast apparatus comprising a rotary shell, a rotary screen arranged within and spaced from the shell, bearing rings a t opposite ends of the barrel, and clamping bolts extending between said bearing rings in the area between said shell and screen and serving to clamp the parts together, in con'ibination with rotary end closures for the barrel. detarhably secured respectively to the endlt'aces of the hearing rings to permit the removal of said end closures Without disturbance oi. the body structure of the barrel one of said end closures including a hinged charging door, and the other of said end closures carrying a rotary lifting drum for the recovery of sand diverted thereto from the drum.

16. A sand blast apparatus comprising a rotary barrel, bearing rings at the opposite ends of the barrel, rotatable end closures for the barrel secured to said bearing rings, and blast nozzles playing through central openings in the end closures upon a charge Within the barrel, in combination With an ele ator drum secured to the bearing ring at one end of said barrel.

17. In a sand blast barrel having at one end a rotary elevator drum, a stationary sectional closure head for the outer end of the drum, one section of the closure head being readily removable to pern'iit access to the interior oi the drum together with a chute secured to said section, and normally supported thereby within the elevator drum.

' In testimony whereof we have signed our names to this specification.

GEORGE C. FATSCHER. CLARENCE E. BILLINt-lS. 

